Fluid braking apparatus



Feb. 14,.'1939. s. scHNr-:LL 2,146,855

FLUID BRAKING APPARATUS Filed 0G11. 50, 1936 W'mvg.

INVENTOR STEVE SCHNE Ll. BV

.ffimproved means for rigidly mounting'a brake `operating fluid motor on.. its supporting element.

Patented Feb. 14, 1939 e 2,146,855 n y vFumo BEARING Arrann'rns l svescnneu, se. Louis, no., assigmgu'wagnef tion otDelaware STATES PAT oFFic-e Electric Corporation, StfLouis, Mo., a'corporaj Y Application octobepao, 193s,A sel-n1 No. masas; seguirne.L (ci. iss-152) "f My invention relates to fluid-operated braking apparatus and one of the objects is to provide Another object of my invention is to so construct afluid motor for a brake that it may be rigidly attached to the brake'shoe supporting elef ment b y a single clamping member and in such a' manner that any force tending to Vrnove the motor in the plane of the support will be translmitted directly to the supporting through the clamping member. A more specic object of'myl invention is to I provide the `cylinder f a uid brake actuating motor with two integral lugs for reception in two l openings ina supportwhereby the cylinder may be rigidly attached to the supportnby a single clamping bolt cooperating with one oi?A the lugs and the other lug may be provided with a passageway for either bleeding `the cylinder or connecting .the cylinder to a uid conducting conduit.

Other objects of my invention will become'apparent from the following description taken in element and not connection with the accompanying drawing in which Figure 1 is a View of a portion of a iluid-A actuated brake showing a double piston uid motor attached to the backing plate in accordj Referring in detail-to Figures l and 2, numeral I indicates a supportingv or backing plate which is secured to some xed part of the vehicle in a well known manner and this plate is adapted to close the open side of a brake drum 2 which is secured to the wheel of the vehicle.v A pair of brake' shoes 3 and! are mounted upon the supporting plate for cooperation with the drum vto y retard the rotation'thereof, these shoes being held in retracted position by a 'suitable' spring 5, the retracted position beingideteimined' by suitable stops not shown. The ends of the brake shoes 3- and 4 are adapted to' be expanded by the fluid motor 6 which comprises a cylinder 1 having ree ciprocable therein Ia pair .of pistons 8 and Q piston 8 cooperating with shoe 3 and piston 9 cooperating with shoe 4 in a well known manner.

In accordance with my invention, I provide improved means for 'attaching the iiuid motor to the backing plate I, this construction being such as to requireonly a single clamping member and also being such that'any forces tending to move the cylinder in the plane of the backing plate will be transmitted ydirectly from the cylinder to the backing plate itself and not by or through the clamping member. The central part of the length as tok extend a short distance beyond the outer surface of the backing plate. The portion of lug II beyond shoulder I3 is' also of such size .as to be snugly received in opening I5 in the backing plate but the length of this portion of the lug is slightly 1less than the thickness of the backing plate as shown in Figure 2.' The lug Il is formed with a screw-threaded hole I6 and cooperating therewith is a 'stud bolt. I1 having a head thereon of greater width than that of opening l5 in the backing plate. When lugs III and I I are inserted in. their respective openings in the backing plate and stud I'I screwed into the l threaded hole of lug Il and turned home, cylinder 'I will be rigidly clamped tothe backing plate at shoulder I3. It is thus seen that this single y bolt is all that is necessary. to hold the uid motor in position. It is impossible for the uid motor tov turn on the backing plate as any turning force is' prevented by lug 'I0 which is received in opening I4A ofthe backing plate. Due to the snug t between lugs Ill' and II and their cooperating openings, any turning forceA on the iluid motor will be taken directly from the cylinder by the backing plate.

The lug I0, in addition toser'ving as a means 'for directly transmitting any turning force on the iiuid motor to the backing plate, is also employed as a convenient means'for attaching a uid supply conduit to the cylinder. 'I'he specific vtype oi.' itting construction between the' fluid supply conduit I8 and the cylinder is shown as also employing a bleeder valve but it is understood that other types of fittings may be eniployed if desired. The lug I0 is formed with a threaded bore I9 which -is incommunicationwith the interior of cylinder 'I` by an axially aligned passage 20 and also a parallel passage 2|. The tting element 22 is formed with a central passage 23 and this fitting' element has a screw-threaded portion which cooperates with the threaded bore I9 and a nose portion 24which iits into passage 20 to thereby place passage 23 of the iitting in direct communication rwith passage 20 in the cyline der wall. The fitting 22 is valso adapted to clamp the bleeder valve construction 25 between it and the end of lug I0, the bleeder valve passage 26 being in communication-with passage 2| inthe cylinder by means ofa suitable groove 21 In the surface of the fitting member 22. The-.supply conduitv I8. may be a copper tube as shown and so a readily apparent that the Wheel cylinder is rigidly 50 plate and is formed with a threaded hole 52.

suitably attached by the usual threaded nut to the outer end of tting 22 so that it is directly in communication with passage 23 of the tltting.v

receiving lug 32 and with a-second opening 33 for receiving lug 33. 'Ihe lug 32, which does not extend entirely through its opening, is provided with a threaded hole 39 for receiving the clamping stud bolt -40 whereby the wheel cylinder maybe clamped to the backing plate in a manner already described with 'respect to the construction shown in Figures 1 and 2.

'I'he lug 33 is also provided with a threaded bore 4| which receives the threaded end of the filuid `conducting conduit 42 whereby iluidmay be supplied to the cylinder to actuate the piston by ,way of .a passage 43 in the cylinder wall. Where two or more single piston motors are employed in a particular type of brake, cylinder 28 may'be pro- 'vided with a passageway 44 for connection with tube 45 in the manner indicated.

In the construction shown in Figure 3 it is secured to the backingA plate and the construction is such that any force tending to turn the fluid motor on the backing plate will be transmitted vdirectly from the cylinder to the backing plate in the manner already'described. The single clamping bolt construction lis sufficient lto produce enough clamping eil'ect to secure the iluid vmotor to the backing plate. I

Referring to Figure 4, I have shown a single piston iiuid motor attached to the backing plate by a slightly modied construction. AThe fluid motor itself is substantially the same as that shown in Figure 3 and the cylinder46 thereof is 45 provided with a pair -of lugs 41 and 48 for cooperation with the openings 49 and 50 in the backing plate 5l. .The lug 41, which is provided with the clamping bolt, extends throughand beyond its cooperating opening in the backing head of the clamping bolt 53, instead of directly engaging the backing plate as in the `construction previously described, is adapted to engage a cap member 54 telescoped upon the projecting endl 55 of lug 41. l

greater in length than the portion of the. lug j The walls of this cap are slightly which extends through the backing plate, thus providing asuftlcient clearance between the end of the lug and the base of the cap, whereby the stud bolt may'proprly clamp the cylinder to the backing plate.

The lug 48, instead of having a conduit attached thereto, is provided with a bleeder screw 55 threaded into the threaded bore 56. of the lug,

65. which lug is in communication with the interior ofthe cylinder by means of the passage 51.*- Fluid is supplied to the iiuid motor by means of the conduit 58 attached to the end of the cylinder as shown.

From the above described embodiments of my The invention it is apparent that 'I 4have devised a very simple and eilicient means -for mountinga fluid motor on a supporting plate of a brake which requires only a single clamping member, such. being, in the present instance; astudbolt. It is also apparent that-the construction is such that any force tending to turn the iluid motor upon lthe' support istransmitteddirectly from the cylinder to the supporting plate and not through the, clamping member. The 4second` integral lug which isv employed to prevent the turning of the iluld motor also serves the -purpose of providing a convenient connecting means for either a fluid conducting conduit or a bleeder passage as the case may demand. A

Having fully described-my invention, what I claim as new and desire to secureby Letters APatent of theUnited States is:

1. In uid braking apparatus, a supporting plate provided with two 'spaced openingsl arotatable drum, a brake shoe for cooperation with the drum, a nuid'motor for actuating the' brake sn'e 'and comprising a iluid receiving cylinder,` said cylinder" being provided with two'integral projections of such size as to sn/ugly iit in the two openings in the supporting plate, one of said projections being provided with a threaded hole ex-v tending into said projection but not communicating with the cylinder, means includinga studA bolt 'having its threaded portion cooperating with the threaded holeand'its head portiorr operatively associated with the plate for clamping the cylinder to` the plate, and said other projection being provided with a threaded hole communicating with the interior of the cylinder and adapted to receive a threaded member having a passage therethrough.

-2. In fluid braking apparatus,- a supporting plate provided with two spaced openings, a rotatable drum, a brake shoe for cooperation'with -the drum; a iluid motor for actuating the brake shoe I and comprising a fluid receiving cylinder, a iluid supply conduit secured tothe cylinderfand commu'nicating with the interior of the cylinder, said cylinder being provided with two integral projections of such size as to snugly fit in the two openings in thesupporting plate, Ione'oisaid projections extending only partially through its' Y opening and being provided with a threaded hole,

meanscomprising a stud` bolt cooperating with the'threaded hole for clamping the cylinder to the plate, said other' projection` being provided with a threaded passage communicating with the interior of N the cylinder, and a threaded bleeder plug for controlling said passage.

3. In fluid braking apparatus, a supporting plate provided with two spacedopenings, a rotatable drum, a brake shoe for cooperation with vthe drum, a fluid motor for actuating the brake shoe and comprising a cylinder, sald cylinder being provided with two integral projections of such size as to snugly ilt in the two openings in the supportf ing plate, one of said projections extending through and beyond its opening and being provided with a threaded hole, a cap overlying said,

projection and having its bottom spaced iromthe end oi' said projection, and a stud bolt cooperating with the threaded hole in the projection for forcing the cap againstlthe plate and clamping the cylinder to the plate.

. -BTEVE SCHNELL. 

